1201212011021 has 16 divisors (see below), whose sum is σ = 1343061390528. Its totient is φ = 1064886345600.

The previous prime is 1201212011009. The next prime is 1201212011047. The reversal of 1201212011021 is 1201102121021.

It is not a de Polignac number, because 1201212011021 - 2²² = 1201207816717 is a prime.

It is a super-2 number, since 2×1201212011021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201212010987 and 1201212011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212031021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1766150 + ... + 2349831.

It is an arithmetic number, because the mean of its divisors is an integer number (83941336908).

Almost surely, 2^{1201212011021} is an apocalyptic number.

1201212011021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201212011021 is a deficient number, since it is larger than the sum of its proper divisors (141849379507).

1201212011021 is a wasteful number, since it uses less digits than its factorization.

1201212011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4116652.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1201212011021 its reverse (1201102121021), we get a palindrome (2402314132042).

The spelling of 1201212011021 in words is "one trillion, two hundred one billion, two hundred twelve million, eleven thousand, twenty-one".